Tissue resecting device including a motor cooling assembly

ABSTRACT

A tissue resecting device includes a handpiece assembly and an end effector assembly. The handpiece assembly includes a motor and a cooling assembly. The cooling assembly includes a housing, a fan assembly, and a fin pack. The fan assembly includes a tubular member configured to be received in the elongate cover, and a plurality of blades rotatably supported on the tubular member and operatively coupled with a drive rotor of the motor for concomitant rotation therewith. The fin pack includes a tubular base and a plurality of fins extending radially outward from the tubular base. The tubular base is disposed within the elongate cover and about the tubular member of the fan assembly. Actuation of the motor rotates the plurality of blades of the fan assembly to thereby advance air through a space between the fin pack and the elongate cover of the housing to facilitate cooling of the motor.

BACKGROUND 1. Technical Field

The present disclosure relates generally to the field of tissueresection. In particular, the present disclosure relates to a tissueresecting device including a cooling assembly.

2. Background of Related Art

Tissue resection may be performed endoscopically within an organ, suchas a uterus, by inserting an endoscope (or hysteroscope) into the uterusand passing a tissue resection device through the endoscope (orhysteroscope) and into the uterus. With respect to such endoscopictissue resection procedures, it often is desirable to distend the uteruswith a fluid, for example, saline, sorbitol, or glycine. The inflow andoutflow of the fluid during the procedure maintains the uterus in adistended state and flushes tissue and other debris from within theuterus to maintain a visible working space. Such fluid may be used toprovide cooling to mechanical or electro-mechanical parts in the tissueresection device. However, such practice requires extensivesterilization of the tissue resection device.

SUMMARY

As used herein, the term “distal” refers to the portion that isdescribed which is farther from a user, while the term “proximal” refersto the portion that is described which is closer to a user. Further, tothe extent consistent, any or all of the aspects described herein may beused in conjunction with any or all of the other aspects describedherein.

In accordance with an aspect of the present disclosure, a tissueresecting device includes a handpiece assembly and an end effectorassembly. The handpiece assembly includes a motor and a coolingassembly. The cooling assembly includes a housing, a fan assembly, and afin pack. The housing includes an elongate cover defining a first lumentherethrough. The fan assembly includes a tubular member configured tobe received in the first lumen of the elongate cover of the housing, anda plurality of blades rotatably supported on the tubular member andoperatively coupled with a drive rotor of the motor for concomitantrotation therewith. The fin pack includes a tubular base and a pluralityof fins extending radially outward from the tubular base. The tubularbase is disposed within the elongate cover and about the tubular memberof the fan assembly. The end effector assembly includes a proximal hubhousing and a cutting member extending distally from the proximal hubhousing and operatively coupled to the drive rotor of the motor.Actuation of the motor rotates the cutting member and the plurality ofblades of the fan assembly to thereby advance air through a spacebetween the fin pack and the elongate cover of the housing to facilitatecooing of the motor.

In an aspect, the housing may further include an adapter portionconfigured to receive a portion of the end effector assembly therein.

In another aspect, the cooling assembly may further include a heattransfer member thermally coupled with the motor. The heat transfermember may include a tubular portion configured to be supported aboutthe tubular member of the fan assembly, and an outer portion extendingdistally from the tubular portion.

In yet another aspect, the tubular portion of the heat transfer membermay be disposed within the elongate cover of the housing, and the outerportion may be external to the elongate cover.

In still yet another aspect, the housing may further include fingersextending distally from the elongate cover such that when the tubularportion of the heat transfer member is received within the elongatecover, the outer portion of the heat transfer member engages the fingersand defines an opening configured to discharge air therethrough.

In an aspect, each fin of the fin pack may extend at least the length ofthe tubular base.

In another aspect, at least a portion of each fin of the fin pack may bein communication with the opening defined between the elongate cover andthe outer portion of the heat transfer member.

In yet another aspect, at least one fin of the plurality of fins of thefin pack may engage the outer portion of the heat transfer member suchthat the at least one fin is thermally coupled with the outer portion.

In still yet another aspect, at least one fin of the plurality of finsof the fin pack may be in communication with a slot defined between theadapter portion and the elongate cover of the housing.

In another aspect, the outer portion of the fan assembly may have anannular configuration.

In still another aspect, the housing may be formed of at least one ofplastic or metal.

In an aspect, at least one of the plurality of fins of the fin pack mayextend distally from the tubular base.

In yet another aspect, the at least one of the plurality of fins of thefin pack may define a gap with the tubular member of the fan assembly.

In accordance with another aspect of the present disclosure, a handpieceassembly for use with a tissue resecting device includes a motorincluding a drive rotor, and a cooling assembly. The cooling assemblyincludes a housing, a fan assembly, a heat transfer member, and a finpack. The housing includes an adapter portion and an elongate coverextending proximally from the adapter portion. The housing defines afirst slot between the adapter portion and the elongate cover. The fanassembly includes a tubular member dimensioned to be received in theelongate cover of the housing, and a plurality of blades operativelycoupled with the drive rotor of the motor for concomitant rotationtherewith. The heat transfer member is disposed about the tubular memberof the fan assembly. The heat transfer member is thermally coupled withthe motor. The fin pack includes a tubular base supported about the heattransfer member, and a plurality of fins circumferentially arrangedabout the tubular base. Actuation of the motor advances air through aspace between the elongate cover and the fin pack.

BRIEF DESCRIPTION OF THE DRAWINGS

Various aspects and features of the present disclosure are describedhereinbelow with reference to the drawings wherein like numeralsdesignate identical or corresponding elements in each of the severalviews and:

FIG. 1 is a side view of a tissue resecting device in accordance with anaspect of the present disclosure;

FIG. 2 is a side view of a distal end portion of an end effectorassembly of the tissue resecting device of FIG. 1, disposed in an openposition;

FIG. 3 is a side view of the distal end portion of the end effectorassembly of the tissue resecting device of FIG. 1, disposed in a closedposition;

FIG. 4 is a cooling assembly of the handpiece assembly in accordancewith an aspect of the present disclosure;

FIG. 5 is a partial perspective view of the cooling assembly of FIG. 4with an elongate cover removed; and

FIG. 6 is an exploded perspective view of the cooling assembly of FIG. 4with parts separated.

DETAILED DESCRIPTION

Referring generally to FIG. 1, a tissue resecting device 10 provided inaccordance with the present disclosure and configured to resect tissueincludes an end effector assembly 100 and a handpiece assembly 200.Tissue resecting device 10 is adapted to connect to a control unit (notshown), e.g., via cable 230, to provide power and control functionalityto tissue resecting device 10, although tissue resecting device 10 mayalternatively or additionally include controls associated with handpieceassembly 200 and/or a power source, e.g., battery, disposed withinhandpiece assembly 200. In other embodiments, tissue resecting device 10is manually powered and/or controlled. Tissue resecting device 10 isfurther adapted to connect to a fluid management system (not shown),e.g., via outflow tubing 240, for removing fluid, tissue, and debrisfrom a surgical site via tissue resecting device 10. The control unitand fluid management system may be integral with one another, coupled toone another, or separate from one another.

With continued reference to FIG. 1, tissue resecting device 10 may beconfigured as a single-use device that is discarded after use or sent toa manufacturer for reprocessing, a reusable device capable of beingcleaned and/or sterilized for repeated use by the end-user, or apartially-single-use, partially-reusable device. With respect topartially-single-use, partially-reusable configurations, handpieceassembly 200 may be configured as a cleanable/sterilizable, reusablecomponent, while end effector assembly 100 is configured as asingle-use, disposable/reprocessable component. In either of the aboveconfigurations, end effector assembly 100 is configured to releasablyengage handpiece assembly 200 to facilitate disposal/reprocessing of anysingle-use components and cleaning and/or sterilization of any reusablecomponents. Further, enabling releasable engagement of end effectorassembly 100 with handpiece assembly 200 allows for use of different endeffector assemblies with handpiece assembly 200.

End effector assembly 100 includes a proximal hub housing 110, anelongated outer shaft 120 fixedly engaged with and extending distallyfrom proximal hub housing 110, an inner cutting shaft 130 movablydisposed within elongated outer shaft 120, and an inner drive core 140.Inner drive core 140 is operably disposed within proximal hub housing110 and coupled to inner cutting shaft 130 such that rotational inputimparted to inner drive core 140, e.g., via handpiece assembly 200,drives rotation of inner cutting shaft 130 within and relative toelongated outer shaft 120. In embodiments, inner cutting shaft 130 maybe configured to additionally or alternatively reciprocate relative toelongated outer shaft 120.

Proximal hub housing 110 of end effector assembly 100 is configured toreleasably engage handle housing 210 of handpiece assembly 200, e.g.,via snap-fit, threaded, luer-lock, lock-button, or other suitableengagement, and may be configured for fixed engagement with handlehousing 210 or rotational engagement therewith. Handle housing 210 maybe formed of metal, plastic, or combination thereof.

Referring also to FIGS. 2 and 3, elongated outer shaft 120 of endeffector assembly 100 includes a proximal end portion 122 extending intoand fixedly engaged within proximal hub housing 110. Elongated outershaft 120 extends distally from proximal hub housing 110 to distal endportion 124 defining a closed distal end 126 and a window 128proximally-spaced from closed distal end 126. Window 128 provides accessto the interior of elongated outer shaft 120 and may be surrounded by acutting edge 129 about the outer perimeter of window 128 so as tofacilitate cutting of tissue passing through window 128 and intoelongated outer shaft 120. Alternatively, edge 129 may be blunt.

Inner cutting shaft 130 includes a proximal end portion 132 and a distalend portion 134 defining a closed distal end 136 and a window 138proximally-spaced from closed distal end 136. The edge of inner cuttingshaft 130 surrounding window 138 defines a cutting blade 139 tofacilitate cutting of tissue passing through window 138 and into innercutting shaft 130. Inner cutting shaft 130 is rotatable relative toelongated outer shaft 120. Inner cutting shaft 130 may be continuouslyrotated in a single direction or may be configured to reverse and movein opposite directions. In either configuration, rotation of innercutting shaft 130 relative to elongated outer shaft 120 defines at leastone open position of end effector assembly 100 (see FIG. 2), whereininner cutting shaft 130 is oriented relative to elongated outer shaft120 such that window 138 at least partially overlaps window 128, thusenabling fluid communication therebetween, and at least one closedposition of end effector assembly 100 (see FIG. 3), wherein innercutting shaft 130 is oriented relative to elongated outer shaft 120 suchthat window 138 does not radially overlap window 128, thus inhibitingfluid communication therebetween. In the at least one open position,cutting blade 139 is exposed; in the at least one closed position,cutting blade 139 is not exposed.

Referring back to FIG. 1, inner drive core 140 of end effector assembly100 may include a generally cylindrical body defining a lumen extendinglongitudinally therethrough. At least a portion of the lumen defines anon-circular cross-section. The inner drive core 140 extends proximallyfrom proximal hub housing 110 of end effector assembly 100 and isconfigured to engage distal drive rotor 222 of a drive assembly 220. Atleast a portion of distal drive rotor 222 defines a non-circularcross-section that is complementary to that of the lumen of inner drivecore 140 such that engagement of distal drive rotor 222 with inner drivecore 140 rotationally fixes distal drive rotor 222 with inner drive core140. In addition, inner drive core 140 extends distally through proximalhub housing 110 and is (directly or indirectly) fixedly engaged withproximal end portion 132 of inner cutting shaft 130 within proximal hubhousing 110. Under such a configuration, rotation of inner drive core140 imparts rotation to inner cutting shaft 130. Thus, with end effectorassembly 100 engaged with handpiece assembly 200, motor 224 may beactivated to drive rotation of distal drive rotor 222, thereby drivingrotation of inner cutting shaft 130 relative to elongated outer shaft120.

Handpiece assembly 200 generally includes a handle housing 210, a driveassembly 220 disposed within handle housing 210, a cooling assembly 500operatively coupled with the drive assembly 220, a cable 230, and anoutflow tubing 240. Handle housing 210, as detailed above, is configuredto releasably engage proximal hub housing 110 of end effector assembly100, and defines a pencil-grip configuration, although otherconfigurations are also contemplated, e.g., a pistol-grip configuration.Handpiece assembly 200 may further include one or more controls (notshown) disposed on or operably associated with handle housing 210 tofacilitate activation of drive assembly 220 in a desired manner.

Drive assembly 220 includes a distal drive rotor 222 and a motor 224that drives rotation of distal drive rotor 222. Distal drive rotor 222is configured to mate with inner drive core 140 of end effector assembly100 upon engagement of end effector assembly 100 with handpiece assembly200 to thereby engage distal drive rotor 222 and inner drive core 140with one another. Cable 230 provides power and/or control signals tomotor 224 to control rotation of distal drive rotor 222.

Referring to FIGS. 4-6, cooling assembly 500 is operatively coupled withmotor 224 (see FIG. 1) and defines handle housing 210 of handpieceassembly 200. In particular, cooling assembly 500 is configured toprovide cooling to motor 224 of drive assembly 220. Cooling assembly 500includes handle housing 210, a fan assembly 520, a heat transfer member540, and a fin pack 560. With particular reference to FIG. 6, handlehousing 210 defines a lumen 504 extending therethrough, and a slot 516that serves as inlet or outlet of air. The handle housing 210 includesan adapter portion 502 configured to releasably engage proximal hubhousing 110 of end effector assembly 100 and receive a portion of innerdrive core 140 within lumen 504 thereof. The elongate cover 508 ofhandle housing 210 is configured to support motor 224 therein and to,e.g., concentrically, receive fan assembly 520, heat transfer member540, and fin pack 560 therein. Distal drive rotor 222 extends distallyfrom motor 224 into adapter portion 502 of handle housing 210 tofacilitate engagement with inner drive core 140 upon engagement of endeffector assembly 100 with handpiece assembly 200. Adapter portion 502and elongate member 508 are separated by slot 516. Handle housing 210further includes a plurality of fingers 509 extending proximally from aproximal portion 508 a of elongate cover 508. Handle housing 210 may beformed as a single construct. In particular, handle housing 210 may bemonolithically formed.

The fan assembly 520 includes a tubular member 522 dimensioned toreceive at least a portion of motor 224 (see also FIG. 1), and aplurality of blades 524 rotatably supported on tubular member 522 suchthat the plurality of blades 524 extends radially outward from tubularmember 522. The plurality of blades 524 is operatively coupled withdistal drive shaft 222 of motor 224 for concomitant rotation therewith.Under such a configuration, fan assembly 520 may be actuated withoutadditional actuation mechanism. In addition, actuation cables 525 extendthrough tubular member 522. Actuation cables 525 impart power andcontrol signals from the control unit (not shown) to motor 224 via cable230 to distal drive rotor 222. Fan assembly 520 is disposed withinhandle housing 210 such that the plurality of blades 524 is disposedadjacent slot 516 of handle housing 210, and tubular member 522 is inregistration with elongate cover 508.

With continued reference to FIGS. 4-6, heat transfer member 540 includesa tubular portion 542 and an outer portion 546 extending distally fromtubular portion 542. Heat transfer member 540 is thermally coupled withmotor 224 (FIG. 1). Tubular portion 542 is supported about tubularmember 522 of fan assembly 520 received within lumen 504 of handlehousing 210. Outer portion 546 of heat transfer member 540 is disposedexternal to handle housing 210 such that fingers 509 engage outerportion 546 such that the outer portion 546 and handle housing 210define an opening 511 to expose at least a portion of fin pack 560 andto serve as an air outlet for fan assembly 520.

With particular reference to FIG. 6, fin pack 560 is dimensioned to besupported on tubular portion 542 of heat transfer member 540. Fin pack560 includes a tubular base 562 defining a lumen 565 therethrough, and aplurality of fins 568 circumferentially arranged about tubular base 562.Each fin 568 extends radially outward from tubular base 562 and along atleast a portion of the length of tubular base 562. In particular, aportion of each fin 568 extends distally from tubular base 562 such thatthe plurality of fins 568 defines a gap with tubular portion 542 of heattransfer member 540 when fin pack 560 is supported about heat transfermember 540.

When fin pack 560 is mounted on tubular portion 542 of heat transfermember 540, heat generated by motor 224 (FIG. 1) is transferred totubular member 522 of fan assembly 520, which is then, transferred toheat transfer member 540. Alternatively, tubular member 522 of fanassembly 520 may be thermally insulated from motor 224, and the heattransfer member 540 may be thermally coupled with motor 224. Heattransfer member 540 is thermally coupled with fin pack 560. When motor224 is actuated, distal drive rotor 222 of motor 224 rotates theplurality of blades 524. In this manner, air is drawn through slot 516of handle housing 210, across blades 524, and is advanced through anannular space between fin pack 560 and elongate cover 508, therebyfacilitating heat transfer away from motor 224 and forced coolingthereof. The air then travels out of opening 511 defined by elongatecover 508 and outer portion 546 of heat transfer member 540. Is alsocontemplated that handle housing 210 may be an additional housingdisposed about the handle housing of cooling assembly 500 and, in suchembodiments, may define slots (not shown) in communication with slot 516and opening 511 to facilitate dissipation of heat out of handle housing210.

With brief reference back to FIG. 1, outflow tubing 240 is configuredsuch that, with end effector assembly 100 engaged with handle housing210, outflow tubing 240 communicates with the internal lumen of innercutting shaft 130 of end effector assembly 100 to receive resectedtissue as well as fluid and other debris withdrawn from an internalsurgical site during use. Outflow tubing 240 is configured to ultimatelyconnect to a collection canister (not shown) or other suitablecollection reservoir for collecting the tissue, fluid, and debriswithdrawn from the internal surgical site. Outflow tubing 240 may extendalong and/or through handle housing 210 or may otherwise be associatedtherewith or separate therefrom.

In order to engage end effector assembly 100 with handpiece assembly200, end effector assembly 100, lead by inner drive core 140, isinserted into handle housing 210 of handpiece assembly 200. Upon furtherinsertion of end effector assembly 100 into handpiece assembly 200,inner drive core 140 is slid about distal drive rotor 222 to therebyrotatably engage distal drive rotor 222 and inner drive core 140 withone another.

Once tissue resecting device 10 is assembled, e.g., once end effectorassembly 100 is engaged with handpiece assembly 200 as detailed above,tissue resecting device 10 is ready for use. In use, tissue resectingdevice 10 is positioned within an internal body cavity or organ, e.g., auterus, such that the distal end portion of end effector assembly 100 ispositioned adjacent tissue to be removed. Tissue resecting device 10 maybe inserted through an endoscope, e.g., a hysteroscope, or other device,or may be used independently.

Once tissue resecting device 10 is positioned adjacent tissue to beremoved, tissue resecting device 10 is activated. Activation of tissueresecting device 10 drives motor 224 which rotationally drives driverotor 222. Rotation of drive rotor 222, in turn, drives rotation ofinner cutting shaft 130 relative to elongated outer shaft 120. At thistime, cooling assembly 500 provides cooling to motor 224 via therotation of the plurality of blades 524 of fan assembly 520, whichestablishes air flow along and about heat transfer member 540 and finpack 560, thereby facilitating the removal of heat from motor 224.Activation of tissue resecting device 10 also serves to activate suctionthrough outflow tubing 240, thereby applying suction through innercutting shaft 130. With such suction applied, tissue is drawn throughwindow 128 of elongated outer shaft 120 and window 138 of inner cuttingshaft 130, while edge 129 and/or cutting blade 139 facilitates cuttingof tissue as a result of the rotation of windows 128, 138 relative toone another. The suction also draws fluid and debris through innercutting shaft 130. The tissue, fluid, and debris suctioned through innercutting shaft 130 travel proximally through inner cutting shaft 130,inflow tubing 240, and ultimately, are deposited in a collectioncanister (not shown). Tissue resecting device 10 may be utilized untilthe desired tissue is removed from the internal body cavity or organ.Once the desired tissue is removed, tissue resecting device 10 may bedeactivated and removed from the surgical site. Thereafter, end effectorassembly 100 may be disengaged from handpiece assembly 200 and discarded(or sent for reprocessing), while handpiece assembly 200 is cleanedand/or sterilized for reuse.

As an alternative to handpiece assembly 200 configured for manualgrasping and manipulation during use, tissue resecting devices 10 mayalternatively be configured for use with a robotic surgical systemwherein the end effector assembly 100 is configured to engage a roboticarm of the robotic surgical system in a similar manner as detailed abovewith respect to engagement of end effector assembly 100 with handpieceassembly 200. The robotic surgical system may employ various roboticelements to assist the surgeon and allow remote operation (or partialremote operation). More specifically, various robotic arms, gears, cams,pulleys, electric and mechanical motors, etc. may be employed for thispurpose and may be designed with the robotic surgical system to assistthe surgeon during the course of an operation or treatment. The roboticsurgical system may include remotely steerable systems, automaticallyflexible surgical systems, remotely flexible surgical systems, remotelyarticulating surgical systems, wireless surgical systems, modular orselectively configurable remotely operated surgical systems, etc.

The robotic surgical system may be employed with one or more consolesthat are next to the operating theater or located in a remote location.In this instance, one team of surgeons or nurses may prep the patientfor surgery and configure the robotic surgical system with the surgicaldevice disclosed herein while another surgeon (or group of surgeons)remotely controls the surgical device via the robotic surgical system.As can be appreciated, a highly skilled surgeon may perform multipleoperations in multiple locations without leaving his/her remote consolewhich can be both economically advantageous and a benefit to the patientor a series of patients.

The robotic arms of the robotic surgical system are typically coupled toa pair of master handles by a controller. The handles can be moved bythe surgeon to produce a corresponding movement of the working ends ofany type of surgical instrument (e.g., end effectors, graspers, knifes,scissors, cameras, fluid delivery devices, etc.) which may complementthe use of the tissue resecting devices described herein. The movementof the master handles may be scaled so that the working ends have acorresponding movement that is different, smaller or larger, than themovement performed by the operating hands of the surgeon. The scalefactor or gearing ratio may be adjustable so that the operator cancontrol the resolution of the working ends of the surgicalinstrument(s).

While several embodiments of the disclosure have been shown in thedrawings, it is not intended that the disclosure be limited thereto, asit is intended that the disclosure be as broad in scope as the art willallow and that the specification be read likewise. Therefore, the abovedescription should not be construed as limiting, but merely as examplesof particular embodiments. Those skilled in the art will envision othermodifications within the scope and spirit of the claims appended hereto.

Although the foregoing disclosure has been described in some detail byway of illustration and example, for purposes of clarity orunderstanding, it will be obvious that certain changes and modificationsmay be practiced within the scope of the appended claims.

What is claimed is:
 1. A tissue resecting device comprising: a handpiece assembly including: a motor; and a cooling assembly including: a housing including an elongate cover defining a first lumen therethrough; a fan assembly including a tubular member configured to be received in the first lumen of the elongate cover of the housing, and a plurality of blades rotatably supported on the tubular member and operatively coupled with a drive rotor of the motor for concomitant rotation therewith; and a fin pack including a tubular base and a plurality of fins extending radially outward from the tubular base, the tubular base disposed within the elongate cover and about the tubular member of the fan assembly; and an end effector assembly including: a proximal hub housing; and a cutting member extending distally from the proximal hub housing and operatively coupled to the drive rotor of the motor, wherein actuation of the motor rotates the cutting member and the plurality of blades of the fan assembly to thereby advance air through a space between the fin pack and the elongate cover of the housing to facilitate cooling of the motor.
 2. The tissue resecting device according to claim 1, wherein the housing further includes an adapter portion configured to receive a portion of the end effector assembly therein.
 3. The tissue resecting device according to claim 2, wherein at least one fin of the plurality of fins of the fin pack is in communication with a slot defined between the adapter portion and the elongate cover of the housing.
 4. The tissue resecting device according to claim 1, wherein the cooling assembly further includes a heat transfer member thermally coupled with the motor, the heat transfer member including a tubular portion configured to be supported about the tubular member of the fan assembly, and an outer portion extending distally from the tubular portion.
 5. The tissue resecting device according to claim 4, wherein the tubular portion of the heat transfer member is disposed within the elongate cover of the housing, and the outer portion is external to the elongate cover.
 6. The tissue resecting device according to claim 5, wherein the housing further includes fingers extending distally from the elongate cover such that when the tubular portion of the heat transfer member is received within the elongate cover, the outer portion of the heat transfer member engages the fingers and defines an opening configured to discharge air therethrough.
 7. The tissue resecting device according to claim 6, wherein at least a portion of each fin of the fin pack is in communication with the opening defined between the elongate cover and the outer portion of the heat transfer member.
 8. The tissue resecting device according to claim 4, wherein each fin of the fin pack extends at least the length of the tubular base.
 9. The tissue resecting device according to claim 4, wherein at least one fin of the plurality of fins of the fin pack engages the outer portion of the heat transfer member such that the at least one fin is thermally coupled with the outer portion.
 10. The tissue resecting device according to claim 1, wherein the outer portion of the fan assembly has an annular configuration.
 11. The tissue resecting device according to claim 1, wherein the housing is formed of at least one of plastic or metal.
 12. The tissue resecting device according to claim 1, wherein at least one of the plurality of fins of the fin pack extends distally from the tubular base.
 13. The tissue resecting device according to claim 1, wherein the at least one of the plurality of fins of the fin pack defines a gap with the tubular member of the fan assembly. 